* {
    margin: 0;
    padding: 0;
}

body {
    background-color: #f3f5f7;
    /* height: 3000px; */
}

.w {
    width: 1200px;
    margin: 0 auto;
}

/* 网页中所有的 li 都清除样式，所以不写 .nav li 这样 */
li {
    list-style: none;
}

a {
    text-decoration: none;
}

.header {
    height: 42px;
    /* background-color: pink; */
    /* 注意此处会层叠 w 里面的margin */
    margin: 30px auto;
}

.logo {
    float: left;
    width: 198px;
    height: 42px;

}

.nav {
    float: left;
    margin-left: 60px;
}

.nav ul li {
    float: left;
    margin: 0 15px;
}

.nav ul li a {
    display: block;
    height: 42px;
    padding: 0 10px;
    line-height: 42px;
    font-size: 18px;
    color: #050505;
}

.nav ul li a:hover {
    border-bottom: 2px solid #00a4ff;
    color: #00a4ff;
}

/* search搜索模块 */
.search {
    float: left;
    width: 412px;
    height: 42px;
    /* background-color: skyblue; */
    margin-left: 70px;
}

.search input {
    float: left;
    width: 360px;
    height: 40px;
    border: 1px solid #00a4ff;
    border-right: 0;
    color: #bfbfbf;
    font-size: 14px;
    text-indent: 15px;
}

.search button {
    float: left;
    width: 50px;
    height: 42px;
    /* background-color: blue */
    /* 按钮button默认有个边框需要我们手动去掉 */
    border: 0;
    background-image: url(images/btn.png);
}

.user {
    float: right;
    line-height: 42px;
    margin-right: 30px;
    font-size: 14px;
    color: #666;
}

.user p {
    /* 让头像居中对齐，自己写的 */
    float: left;
    width: 42px;
    height: 42px;
    background-image: url(images/user.png);
    background-position: center;
    background-repeat: no-repeat;
}

/* banner区域 */
.banner {
    height: 421px;
    background-color: #1c036c;
}

.banner .w {
    height: 421px;
    /* background-color: pink; */
    background-image: url(images/banner2_20190819_210028.png);
    background-repeat: no-repeat;
    background-position: center;
}

.subnav {
    float: left;
    width: 190px;
    height: 421px;
    background-color: rgba(0, 0, 0, .3);
}

.subnav ul li {
    height: 45px;
    line-height: 45px;
    margin: 0 20px;
    /* 上面用padding: 0 20px;也可以，因为没给ul指定宽度就不会撑开盒子 */
}

.subnav ul li a {
    color: #fff;
    font-size: 14px;
}

/* 下面是让前端开发到产品这个数列上下间距一样,但是加了后那个大于符号要前移 */
.subnav ul {
    /* float: left;  加了就紧跟着上一个浮动在左边点去了 */
    margin-top: 5px;
}

.subnav ul li a span {
    float: right;
}

.subnav ul li a:hover {
    color: #00a4ff;
}

.course {
    float: right;
    width: 230px;
    height: 300px;
    background-color: #fff;
    /* 浮动的盒子不会有外边距合并的问题 */
    margin-top: 50px;
}

.course h2 {
    height: 48px;
    line-height: 48px;
    text-align: center;
    background-color: #9bceea;
    color: #fff;
    font-size: 18px;
}

.bd {
    padding: 0 20px;
}

.bd ul li {
    padding: 14px 0;
    border-bottom: 1px solid #ccc;
}

.bd ul li h4 {
    font-size: 16px;
    color: #4e4e4e;
}

.bd ul li p {
    font-size: 12px;
    color: #a5a5a5;
}

.bd .more {
    display: block;
    height: 38px;
    border: 1px solid #00a4ff;
    text-align: center;
    line-height: 38px;
    color: #00a4ff;
    font-size: 16px;
    font-weight: 700;
    margin-top: 5px;
}

/* 精品推荐模块 */
.goods {
    height: 60px;
    background-color: #fff;
    box-shadow: 0 2px 3px 3px rgba(0, 0, 0, .1);
    margin-top: 10px;
}

.goods h3 {
    float: left;
    color: #00a4ff;
    line-height: 60px;
    margin-left: 30px;
    font-size: 16px;
}

.goods ul {
    float: left;
    line-height: 60px;
    margin-left: 30px;
}

.goods ul li {
    float: left;
}

.goods ul li a {
    padding: 0 30px;
    font-size: 16px;
    color: #050505;
    border-left: 1px solid #ccc;
}

.mod {
    float: right;
    line-height: 60px;
    margin-right: 30px;
    font-size: 14px;
    color: #00a4ff;
}

.box {
    margin-top: 30px;
}

.box-hd {
    height: 45px;
    /* overflow: hidden; */
}

.box-hd h3 {
    float: left;
    font-size: 20px;
    color: #494949;
}

.box-hd a {
    float: right;
    font-size: 12px;
    color: #a5a5a5;
    margin-top: 10px;
    margin-right: 30px;
}

.box-bd ul {
    width: 1225px;
}

.box-bd ul li {
    float: left;
    width: 230px;
    height: 270px;
    background-color: white;
    margin-right: 15px;
    margin-bottom: 15px;
}
/* 下面这个为啥不行 */
/* .box-bd ul li .qwe {
    margin-right: 0;
} */
.box-bd ul li img {
    width: 100%;
}
.box-bd ul li h4 {
    margin: 20px 20px 20px 25px;
    font-size: 14px;
    font-weight: 400;
    color: #050505;
}
.box-bd .info{
    margin: 0 20px 0 25px;
    font-size: 12px;
    color: #999;
}
.box-bd .info span {
    color: #ff7c2d;
}
.footer {
    
    height: 415px;
    background-color: white;
}
/* 给前面的内容父盒子 .box 添加清除浮动 */
.box {
    overflow: hidden;
}
.footer .w {
    padding-top: 35px;
}
.copyright {
    float: left;
}
.copyright p {
    font-size: 12px;
    color: #666;
    margin-top: 20px;
    margin-bottom: 15px;
}
.copyright .app {
    display: block;
    width: 118px;
    height: 33px;
    border: 1px solid #00a4ff;
    font-size: 16px;
    color: #00a4ff;
    text-align: center;
    line-height: 33px;
}
.links {
    float: right;
}
.links ul {
    float: left;
    margin-left: 100px;
}
.links ul .a {
    font-size: 16px;
    color: #333;
    margin-bottom: 5px;
}
.links ul .b {
    font-size: 16px;
    color: #333;
    margin-bottom: 5px;
}
.links ul .c {
    font-size: 16px;
    color: #333;
    margin-bottom: 5px;
}
.links ul a {
    color: #333;
    font-size: 12px;
}
